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        <h1 class="post-card-title">关于Eclipse安卓开发中的文件调用</h1>
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            发表于
            <time class="post-time" title="2022-05-18 02:35:09" datetime="2022-05-17T18:35:09.000Z"  itemprop="datePublished">2022-05-18</time>

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	分类：<ul class="article-category-list"><li class="article-category-list-item"><a class="article-category-list-link" href="/blog/categories/%E6%9D%82%E8%AE%B0/">杂记</a></li></ul>


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            阅读本文可能花费您&nbsp;<span class="post-count">2.2</span>&nbsp;分钟
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        <div class="post-content" id="post-content" itemprop="postContent">
            <p>Java项目读取resources资源文件路径那点事</p>
<span id="more"></span>

<h2 id="问题描述"><a href="#问题描述" class="headerlink" title="问题描述"></a>问题描述</h2><p>最近在用Eclipse做Android的时候使用jxl库简单处理了xls文件，由于我对xls文件处理不太熟练，于是创建了一个Java项目进行简单测试，没问题之后直接在安卓项目使用，但是却发现<strong>即使我把xls文件放在assets文件夹下并在Build Path里面勾选了assets文件夹</strong>依旧会抛出找不到文件的错误：FileNotFoundException，采用了</p>
<pre><code class="java">file:///android_asset/xxx.html
</code></pre>
<p>和</p>
<pre><code class="java">/assets/xxx.xls
</code></pre>
<p>均没有效果，依旧会抛出错误。</p>
<h2 id="问题原因"><a href="#问题原因" class="headerlink" title="问题原因"></a>问题原因</h2><p>一般情况下我们在本地项目引用文件，直接用绝对路径或者相对路径都可以，这两者都可以在资源文件的属性里面查看，如下图所示：</p>
<figure class="image-bubble">
                <div class="img-lightbox">
                    <div class="overlay"></div>
                    <img src="https://s2.loli.net/2022/05/18/r6SBcVZJkpTGbOE.png" alt="image-20220518100916219" title="">
                </div>
                <div class="image-caption">image-20220518100916219</div>
            </figure>

<p>Android项目打包生成APK之后，会将项目打包成Jar包或者war包，此时就不会存在 assets/resources 目录，JVM会在编译项目时，主动将 java文件编译成 class文件 和 resources 下的静态文件放在 target/classes目录下；  </p>
<p>也就是说我们在打包之后上述目录结构已经发生变化，此时再用原来的路径去索引文件，必然是索引不到的，那么我们还想去索引这个文件怎么办呢？</p>
<h2 id="解决方案"><a href="#解决方案" class="headerlink" title="解决方案"></a>解决方案</h2><p>我们可以用Java提供的方法获取文件流</p>
<pre><code class="Java">InputStream input = this.getClass().getResourceAsStream("/assets/xxx.xls");
</code></pre>
<p>从而去使用文件。</p>
<p>需要注意的是，路径的开头的 / 是不能少的，它代表的就是从src目录-根目录，而资源文件路径就是从src开始找，这样工程打包以后同样可以找到路径。</p>
<p>参考：<a target="_blank" rel="noopener" href="https://www.cnblogs.com/blogtech/p/11151780.html">Java项目读取resources资源文件路径那点事 </a></p>

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